makes miai of a and b. At the same time, it protects against a clamp at c by setting up an ambush. The shape here also occurs in problems 18 and 34.
White makes a attachment at , but Black calmly takes the miai point at . White seemingly connects underneath, but Black has the throw in tesuji at . White captures, next ..
If here, then White plays at , threatening to connect at a. If Black plays b to prevent this, then White can prevent a second eye to the right of b, and kill, with c or d
Note that must not be played here! Then and lives, after sacrificing the two Black stones on the right. Of course, if makes the mistake of playing at to save the two stones, White plays the placement at and Black loses everything instead.
White can answer at or at a. After , white a and black b do not create a ko, as shown by the next diagram.
Following on from diagram #3 above, to attempts to create a seki. However, is a tesuji that will kill Black.
But the placement at kills the entire black group. Note that if carelessly plays atari on the five black stones at a, Black lives at instead, with the under the stones technique.
KarlKnechtel: For completeness, note Black cannot live via under the stones by sacrificing six stones either:
Black tries to continue via standard under the stones technique, but ends up almost filled with a dead shape .
Problem 37
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